Engine timers?

[Keener]

Has anyone used one of these? What would be the engine hour intervals for oil changes or other maintenence?

http://www.sendec.com/meters/

I hear Yamaha and Dubach sells it too.

[Burnrider]

I don't know what your riding conditions are like, but that is way too much to carry for a day of beating the trail with your bike and body. I recomend a good electronic speedo. Try the enduro models or if you feel handy, the water resistive bicycle speedos work great. That website looks way too clean room needy for a dirt scooter.